Radio Ferrit

Network Time Protocol (NTP) is one of the Internet’s oldest protocols still used, invented by Dr David Mills from the University of Delaware, it has been in utilized since 1985. NTP is a protocol designed to synchronize the clocks on computers and networks across the Internet or Local Area Networks (LANs).

NTP (version 4) can maintain time over the public Internet to within 10 milliseconds (1/100th of a second) and can perform even better over LANs with accuracies of 200 microseconds (1/5000th of a second) under ideal conditions.

NTP works within the TCP/IP suite and relies on UDP, a less complex form of NTP exists called Simple Network Time Protocol (SNTP) that does not require the storing of information about previous communications, needed by NTP. It is used in some devices and applications where high accuracy timing is not as important.

Time synchronisation with NTP is relatively simple, it synchronises time with reference to a reliable clock source. This source could be relative (a computer’s internal clock or the time on a wrist-watch) or absolute (A UTC – Universal Coordinated Time – clock source that is accurate as is humanely possible).

It is strongly recommended by Microsoft and others, that external based timing should be used rather than Internet based, as these can’t be authenticated. Specialist NTP servers are available that can synchronise time on networks using either the MSF (or equivalent) or GPS signal.

Atomic clocks are the most absolute time-keeping devices; however, they are extremely expensive and are generally only to be found in large-scale physics laboratories. However, NTP can synchronise networks to an atomic clock by using either the Global Positioning system (GPS) network or specialist radio transmission (MSF in Britain).

The MSF national time and frequency radio transmissions used to synchronise an NTP server is broadcast by the National Physics Laboratory in Cumbria which serves as the United Kingdom’s national time reference, there are also similar systems in Colorado, US (WWVB) and in Frankfurt, Germany (DCF-77).

A radio based NTP time server usually consists of a rack-mountable time server, and an antenna, consisting of a ferrite bar inside a plastic enclosure, which receives the radio time and frequency broadcast. The antenna should always be mounted horizontally at a right angle toward the transmission for optimum signal strength. Data is sent in pulses, 60 a second. These signals provides UTC time to an accuracy of 100 microseconds, however, the radio signal has a finite range and is vulnerable to interference.

A radio referenced NTP servers is easily installed and can provide an organization with a precise time reference enabling the synchronization of entire networks

About the Author:

Richard N Williams is a technical author and a specialist in the telecommunications and network time synchronisation industry helping to develop dedicated time server products; ethernet clocks, GPS time servers, NTP servers, digital wall clocks, atomic clock servers and SNTP time servers. Please visit us for more information about NTP products and NTP servers

Article Source: ArticlesBase.com – Installing a Ntp Server Using a Radio Reference Source

Exposures to devices such as mobile phones are very risky for everyone, especially children and adolescents. It is because side effects of radio frequency radiation. People have been warned that children under age eight should only use cell phones during emergencies, and teen managers should limit its appeal to just 10 minutes.

Mobile phones are designed to transmit radio waves in all directions because base stations can be found in any direction with respect to phone users. This means that lots of the radio waves they produce are directed towards your body.

However, it is a safe and effective device that can protect you from harmful radiation caused by mobile devices. It's called – Accounts Ferret. But what exactly Ferret beads?

A ferrite bead is simply a hole or cylinder has of ferrite, which is a semi-magnetic substance made from iron oxide (rust) alloyed with other metals. It is most commonly used with computer cables in which slides over the cable, while cable is being made, or around the cable snapped in two pieces after the cable is made. In a computer system typical, found in a house or office, you will see these "bumps" in the mouse, keyboard and monitor cables.

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It's not too late to avoid the dangerous effects of radiation on our bodies. Cell phones not only are associated with it, but a large number of devices and modern appliances such as microwave, wireless handheld devices, computers and more.

Since cell phones are one of the most important devices we use for communication, we have to us almost every day. And that means there is a tendency to increase the risk of radiation. Exposure to radiation from cell phones is a concern growing, not only in America but worldwide. As we realized the negative effects, especially when we are looking for ways to protect ourselves from the potential threat.

About the Author:

Dr. Joseph Mercola is the founder of the number 1 Natural Health Information website and publisher of the FREE Mercola.com health newsletter.

Article Source: ArticlesBase.com – Children and Teen Should Stay Away From Cell Phones